Coil component

Abstract

A coil component includes a body, a coil portion disposed in the body and having first and second lead-out portions exposed to at least one surface of the body to be spaced apart from each other, first and second external electrodes disposed on the at least one surface of the body to be spaced apart from each other, and respectively connected to the first and second lead-out portions, a dielectric layer disposed on a surface of the body, and a third external electrode disposed on the surface of the body having the dielectric layer disposed thereon to be spaced apart from each of the first and second external electrodes, and covering the dielectric layer.

What is claimed is: 
     
       1. A coil component comprising:
 a body; 
 a coil portion disposed in the body, and having first and second lead-out portions exposed from at least one surface of the body to be spaced apart from each other; 
 first and second external electrodes disposed on the at least one surface of the body to be spaced apart from each other, and respectively connected to the first and second lead-out portions; 
 a dielectric layer disposed on a surface of the body and spaced apart from the first and second external electrodes; and 
 a third external electrode disposed directly on the surface of the body having the dielectric layer disposed thereon to be spaced apart from each of the first and second external electrodes, and covering the dielectric layer. 
 
     
     
       2. The coil component according to  claim 1 , wherein the third external electrode is in contact with a surface of the body. 
     
     
       3. The coil component according to  claim 1 , wherein the coil portion further comprises a feed portion exposed from the surface having the dielectric layer disposed thereon of the body to be spaced apart from each of the first and second lead-out portions,
 wherein the dielectric layer is disposed on an exposed surface of the feed portion. 
 
     
     
       4. The coil component according to  claim 3 , wherein the feed portion includes a plurality of feed portions, each spaced apart from the first and second lead-out portions, and exposed from different surfaces of the body to be spaced apart from each other, and
 the dielectric layer and the third external electrode respectively include a plurality of dielectric layers and a plurality of third external electrodes disposed on exposed surfaces of the plurality of feed portions. 
 
     
     
       5. The coil component according to  claim 4 , wherein at least two of the plurality of third external electrodes are in contact with each other. 
     
     
       6. The coil component according to  claim 4 , wherein at least two of the plurality of third external electrodes are not in contact with each other. 
     
     
       7. The coil component according to  claim 3 , further comprising a conductor film disposed between the surface of the body having the dielectric layer disposed thereon and the dielectric layer and covering an exposed surface of the feed portion. 
     
     
       8. The coil component according to  claim 7 , wherein the dielectric layer covers the conductor film. 
     
     
       9. The coil component according to  claim 7 , wherein the feed portion includes a plurality of feed portions, each spaced apart from the first and second lead-out portions, and exposed from different surfaces of the body to be spaced apart from each other, and
 the conductor film, the dielectric layer, and the third external electrode respectively include a plurality of conductor films, a plurality of dielectric layers, and a plurality of third external electrodes disposed on exposed surfaces of the plurality of feed portions. 
 
     
     
       10. The coil component according to  claim 1 , wherein the dielectric layer comprises an insulating resin. 
     
     
       11. The coil component according to  claim 1 , wherein the body has one surface and another surface opposing each other, two end surfaces connecting the one surface and the other surface of the body and opposing each other, and two side surfaces connecting the end surfaces of the body and opposing each other,
 wherein the first and second external electrodes are disposed on respective end surfaces of the two end surfaces of the body and are respectively connected to the first and second lead-out portions exposed on the respective end surfaces of the two end surfaces of the body, and 
 the dielectric layer and the third external electrode are disposed on one side surface of the two side surfaces of the body. 
 
     
     
       12. The coil component according to  claim 1 , further comprising a noise removal portion including a loop pattern having two end portions spaced apart from each other to form an open-loop, and a lead-out pattern connected to the loop pattern and the third external electrode, and disposed to be spaced apart from the coil portion in the body; and
 an internal insulating layer disposed between the coil portion and the noise removal portion. 
 
     
     
       13. The coil component according to  claim 12 , wherein the two end portions of the loop pattern are disposed to be spaced apart from each other by a slit. 
     
     
       14. The coil component according to  claim 13 , wherein the body has one surface and another surface opposing each other, two end surfaces connecting the one surface and the other surface of the body and opposing each other, and two side surfaces connecting the end surfaces of the body and opposing each other,
 wherein the lead-out pattern is exposed from one side surface among the two side surfaces of the body, and is connected to the third external electrode disposed on the one side surface of the body, and 
 a distance from one end portion of the loop pattern to the one side surface of the body is equal to or greater than a distance from the other end portion of the loop pattern to the other side surface of the body. 
 
     
     
       15. The coil component according to  claim 1 , wherein the third external electrode is electrically isolated from the coil portion. 
     
     
       16. A coil component comprising:
 a body; 
 a coil portion disposed in the body and including a coil having a plurality of turns disposed adjacent to each other on a plane; 
 first and second external electrodes disposed on at least one surface of the body and connected to opposite ends of the coil; 
 an insulating layer spaced apart from the first and second external electrodes, disposed on a surface of the body that intersects the plane, and having a composition different from the body; and 
 a third external electrode disposed on the insulating layer, and directly on the body, so as to be free of overlap with the first and second external electrodes on surfaces of the body. 
 
     
     
       17. The coil component of  claim 16 , wherein the coil portion includes a feed portion extending from the outermost turn of the plurality of turns to the surface of the body having the insulating layer thereon, and
 the insulating layer overlaps the feed portion exposed to the surface of the body. 
 
     
     
       18. The coil component of  claim 17 , further comprising a conductor disposed on the surface of the body having the insulating layer thereon to be between the insulating layer and the surface of the body, and contacting the feed portion. 
     
     
       19. The coil component of  claim 16 , wherein the third external electrode contacts a surface of the body along at least one edge of the insulating layer. 
     
     
       20. The coil component of  claim 16 , wherein the insulating layer and third external electrode are disposed only on portions of the body that are free of the first and second external electrodes. 
     
     
       21. The coil component of  claim 16 , wherein the insulating layer comprises a dielectric and has a composition different from a composition of the body. 
     
     
       22. The coil component of  claim 16 , wherein the plane is orthogonal to a coil axis of the coil. 
     
     
       23. The coil component according to  claim 16 , wherein the third external electrode is electrically isolated from the coil portion. 
     
     
       24. A coil component comprising:
 a body; 
 a coil portion including a coil disposed in the body; 
 first and second external electrodes disposed on at least one surface of the body; 
 a dielectric layer disposed on at least another surface of the body and spaced apart from the first and second external electrodes so as to be free of contact with the first and second external electrodes; and 
 a third external electrode disposed on the dielectric layer, and directly on the body, and free of contact with the first and second external electrodes. 
 
     
     
       25. The coil component of  claim 24 , wherein the first and second external electrodes are disposed on respective opposing end surfaces of the body, and
 the dielectric layer includes at least one dielectric layer disposed on opposing side surfaces of the body. 
 
     
     
       26. The coil component of  claim 24 , wherein the dielectric layer and third external electrode are disposed only on portion of surfaces of the body that are free of the first and second external electrodes. 
     
     
       27. The coil component of  claim 24 , wherein the third external electrode contacts a surface of the body along at least one edge of the dielectric layer. 
     
     
       28. The coil component of  claim 24 , wherein the coil portion extends to a surface of the body having the dielectric layer disposed thereon. 
     
     
       29. The coil component according to  claim 24 , wherein the third external electrode is electrically isolated from the coil portion.